fix word err in Disruption

zhangmingld · zhangmingld · commit 8b7f2f0d9a3e · 2018-11-05T16:55:43.000+08:00
diff --git a/content/en/docs/concepts/workloads/pods/disruptions.md b/content/en/docs/concepts/workloads/pods/disruptions.md
@@ -93,7 +93,7 @@ time as frequent voluntary disruptions.  We call this set of features
 ## How Disruption Budgets Work
 
 An Application Owner can create a `PodDisruptionBudget` object (PDB) for each application.
-A PDB limits the number pods of a replicated application that are down simultaneously from
+A PDB limits the number of pods of a replicated application that are down simultaneously from
 voluntary disruptions.  For example, a quorum-based application would
 like to ensure that the number of replicas running is never brought below the
 number needed for a quorum. A web front end might want to
